Ionic mobility and structure of glasses in Zrf4—Bif3—Mf2 (M = Sr, Ba, Pb) systems according to Nmr, Ir, and Raman spectroscopic data

Abstract

The NMR (19F and MAS NMR 19F), IR, and Raman spectroscopic methods are used to study the ionic mobility and structure of a series of new glasses in ZrF4—BiF3—MF2 (M = Sr, Ba, Pb) systems in a temperature range of 180 K to 500 K. The temperature range, in which diffusion of fluorine ions becomes the dominant form of ionic motion, is determined by the nature of the M2+ cation. The factors determining the basic model of the structure of glasses in ZrF4—BiF3—MF2 (M = Sr, Ba, Pb) systems and conditions under which bismuth polyhedra can participate in the construction of the glass network are considered. According to the data of impedance spectroscopy, the studied glasses have relatively high ionic conductivity (δ ≥ 10–4 S/cm above 480 K).